Chevrolet Blazer Turn Signal Indicator Bulb Size

Additional Notes

• The Chevrolet Blazer turn signal indicator uses four distinct bulb types across its model years: PC74, 194, 74, and 168, all of which conform to ANSI standards applicable in the United States and Canada.
• The PC74 is a T5 miniature wedge bulb rated at 12V and 1.4W, distinguished from other types by its printed circuit board twist-lock socket, which is specific to instrument cluster applications. It is the most frequently specified bulb in these records, covering the 1997-2003 model years.
• The 74 bulb shares the same T5 form factor, 12V operating voltage, and 1.4W power rating as the PC74, but it uses a standard wedge base rather than a twist-lock socket. The Blazer used the 74 in 1993-1994.
• Because the PC74 and 74 differ in socket type despite identical electrical ratings, they are not interchangeable without a compatible socket present in the vehicle.
• The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W. It was specified for the 1990-1991 and 1995-1996 model years.
• The 168 is also a T10 miniature wedge bulb operating at 12V, but it draws 4.9W, making it the highest-wattage bulb in these specifications. It was used in the 1987-1989 model years.
• Although the 194 and 168 share the T10 wedge form factor and the same voltage, their wattage values differ. Substituting one for the other may affect brightness and circuit load.
• All four bulb types operate on a 12V circuit, consistent with standard automotive electrical systems.